Apparatus for treating yarn



p 1942- c. F. .GRAM 2, 9 ,902

APPARATUS FOR TREATING I Filed April 18-, 1941 T 2 Sheets-Sheet 1 Sept. 8, 1942. F. GRAM" 2,294,902. 2

APPARATUS FOR TREATING YARN Filed April 18,1941 2 Sheets-Sheet 2 C/IPL F6214 Patented Sept. 8, 1942 APPARATUS FOR TREATING YARN Carl F. Gram, Elizabethton, Temp, assig'nor to North American Rayon Corporation, New York, N. Y., a corporation of Delaware Application April 18, 1941, Serial No. 389,252

4 Claims. (01. 68-205) The present invention relates to the spraying of liquids on rotating surfaces but more particularly has for its object to devise an apparatus for use in the wet treatment of threads which are conveyed on rollers during the wet treatment thereof.- By spraying it is meant that the liquid is applied to the roller and threads in fine A streams which are concentrated in a small area. It is not intended,- according to the invention, to

spray. in such a manner as to cause the treating liquid to be broken up into droplets or spread in,

streams over the greater portion of the cylinder.

Obviously if such were done it would be impossible to cause the treating liquids to spread in an even film over the rollers without splashing.

In the treatment of threads or yarns particularly those of synthetic origin, it is frequently found desirable to treat them in continuous lengths. This is done by passing them around self-feeding rollers or spaced rollers whereby the filaments are conveyed in an approximately helical path from one end thereof to the other end of the said reels or rollers. In'their passage around the conveying surfaces they are sprayed through a medium of nozzles with the desired treating solutions. I

During the wet treatment, it is .essential that the threads be treated uniformly. In order to obtain uniform treatment, the liquid sprayed on the, threads should be sprayed in such fashion that no splashing occurs but that the liquids spread in an even film over the surface of the rollers where the threads pass around them.

It is particularly desirable to eliminate the splashing of treating liquids in the treatment of freshly extruded artificial silk which is manufactured by the so-called continuous process whereby the filaments manufactured are spun,

' wet treated, and dried, in a continuous operation.

In the continuous process a spinning solution is extruded from a spinning nozzle and into an acid bath whereby the filaments thus extruded are coagulated. The threads are then passed to rotating surfaces which may convey the yarn or thread through the difierent after-treatment steps such as desulphurization, deacidification', etc., and are then dried, all in one continuous operation. The yarn is sprayed with the differ- I treating fluids from the second nozzle, it is desirable that splashing be eliminated so that the different treatments be given uniformly and at the proper time. For example when acid is sprayed as during the desulphurization step. it is essential that the acid thus sprayed spreads on the rollerin an even film without splashing, so that acid will not be splashed into the water zone or the other treating zones and affect the treatment of the threads in the other stages of the process. By eliminating the splashing of the treating solutionsas'the rollers rotate, the different solutions may be kept separate and the threads or yarns receive uniform treatment. Further, by eliminating splashing there will be no dangerof the operators of the machines being splashed with fluids which may cause injury to them or their clothing.

It is therefore one object of the present invention to devise an apparatus for spraying of liquids on rotating surfaces whereby more uniform treatment of the material conveyed thereon will result.

Another object of the present invention is to devise an apparatus for the spraying of the liquids on yarn-conveying surfaces wherebya more uniform treatment of the yarn is achieved and splashing of the treating liquid is eliminated.

These and other objects of the present invention will in partbecome obvious and will in part be pointed out in the following specification and appended claims when taken in conjunction with the attached drawings, in which,

Figure 1 illustrates a. diagrammatic side elevation of a spinning machine embodying the present invention and showing the angle of the spray ent treating solutions while on the rollers or reels as the threads pass therearound. As illustrated in the drawings accompanying this application, a

nozzle is supplied for each roller whereby distinct separation of different treating solutions is achieved. Should, as may be the case, acid be sprayed from one nozzle and. water or other 55 jets with relation to the horizontal plane of the axis and the peripheries ofthe rollers. Figure 2 is a similar view to Fig. 1, showing the position of the jets while stantially horizontal.

Figure 3 is an end elevation of the machine taken in the direction of the arrow A with the the rollers are sub spray nozzle at an angle which is in the direction of rotation of the roller and Figure 4 is an end elevation of one of the rollers and spray nozzles of a spinning machine with the spray nozzle at an angle which is against the direction of rotation of the roller.

Figure 5 is a side elevation of a portion of one of the treating rollers with the spray nozzle shlciwn at an angle to the longitudinal axis of the ro er.

4 .Figure 6 is a figure similar to Figure 5 with an angle opposite to that of Figure 5.

the exception that the spray nozzle ispointed at m the drawings, in which like numerals indicate like parts, I designates the thread oryarn which is passed from any suitable source of supply (not shown). Theyarn or thread l'which is to be wet-treated is conveyed by roller 2 and delivered thereby to apair of rotating cylinders l and 3a which may be rotating on axes which are at an angle to the horizontal. These cylinders 3 and in may also be inclined to one another whereby the filaments or threads looped there around are advanced in an approximately helical path from one end of the rollers to the other end thereof. V

As is clearly shown in the drawings, the filaments or threads I are sprayed by means of spray the spraying nozzles in such fashion that the axis of the spray is in a plane which is at right angle to the-horizontal plane passing through the axis of the roller. The sprays thus directed against 3 the treating rollers havea tendency to splash,

resulting in a non-uniform treatment of the material being sprayed and possibly causing diflicultiesin the operation of the machines. It is obvious that if the liquid sprayed on a roller, which is rotating, splashes, considerable splashing will rotation of the roller.

- which is at right angle to the horizontal plane passing through the axis of the roller.

In Figure 5 is shown still another angle at which the spray nozzle 4 may be angled with relation to the roller 3 so as to eliminate splashing. In this figure thespraynozzle isshown directing a spray which is at an angle to the longitudinal axis of the roller.

Figure 6 discloses still another mannerof directing the spray against the treating roller. In this form of the invention the spray nozzle directs a spray in'an opposite angle to that shown in Figure 5 of the drawings but the axis of the spray is still at an angle to the longitudinal axis of the treating surface.

It has therefore been found by the inventor of this novel spraying method that provided the roller is not sprayed with a spray whose axis is in a plane which is at right angle to the horizontal plane passing through the axis of the roller, a splashing can be and is practically eliminated. This is true even in those instances wardly to the treating roller but which is of! I center from the center of rotation of the surface sprayed and therefore at an angle to the result by reason of the force derived from the i It has been found after considerable experimentation that this splashing of the liquid sprayed on a rotating surface can be eliminated, provided the axis of the spray is at any other angle than in a plane which is at right angle to the horizontal plane passing through the axis of the roller. It has even been found that this principle remains true when the roller is sprayed with a spray whose axis is at an angle against the rotation of the roller. The gist of the invention, therefore, resides in spraying rotating surfaces with sprays-whose axes are at an angle other than in a plane which is at right angle to the horizontal plane passing through the axis of the roller.

As clearly illustrated in Figure 3 of the drawings, the nozzle is shown directed at an angle which inclines toward the direction of rotation of the rollers so that the spraying of liquid falls on a slant in the direction of rotation of the rollers and it has been found that this eliminates all splashing.

In Figure 3 of the drawings the arrow indicates the direction of rotation of the rollers and it will be readily apparent that the spray of liquid is also directed in the direction of rotation: By

' thus positioning the spraying nozzle an even film is distributed overthe surface of the threads and the treating roller and all splashing is eliminated.

In Figure 4 of the drawings, the spray nozzle I is. shown positioned at an angle to direct spray against the rotation of the roller 3a. The liquid when sprayed at an angle such as this tends to peripheral surface of the roller.

In view of the foregoing description when taken in connection with the drawings, it will be obvious that many variations may be made in the method and apparatusdescribed herein while utilizing the invention of the present application and it is not intended to restrict theinvention to the particular descriptions or examples given herein. The terms used in describing the invention have been used in their descriptive sense and not as terms of limitation and it is intended that all equivalents thereof be included within the scope of the appended claims.

This is a. continuation in part of my 'copending application Serial No. 175,569, flied November 20, 1937, for Apparatus for treating yarn.

What is claimed is: 1; An apparatus for the wet treatment of artificial yarns including a roller which is in-, clined with respect to the horizontal and over which the yarns to be treated are "passed and a fluid jet mounted adjacent to said roller for apaxis of the roller and in a direction pointing.

away from the said axis of the roller toward the periphery thereof. I

2. An apparatus for the wet treatment of newly formed artificial filaments which includes a pair of spaced driven rollers which are inclined with respect to the horizontal and over which the filaments are looped and advanced in' ahelical path from one end of the rollers to the opposite ends thereof, liquid spray jets mounted adjacent the said rollers for applying a non-splashing film of treating liquid thereto, said jets being directed against said rollers at an angle otherthan a angle with respect to the axis of rotation of said rollers andin a direction pointing away from the axis of said rollers toward their peripheries.

3. An apparatus for the wet treatment of artificial yarns including a roller over which the yarns to be treated are passed and a fluid jet mounted adjacent to said roller for applying a non-splashing spray of liquid thereto, said Jet being positioned in a plane which is inclined to the horizontal plane passing through the axis of the roller and. in a direction pointing awayirom the said axis of theroller toward'the periphery thereof.

4. An apparatus for the wet treatment of newly formed artificial filaments which includes a. pair of spaced rollers over which the filaments are looped-andadvanced in a substantially helical path iromwone end 01; the rollers to the opposite ends thereoLdlquid spray; jets mounted adjacent the said rollersfor applying a non-splashing film of treating liquid theretogsaid jets being directed CARL r. GRAM. 

